Beam failure recovery method and terminal

Abstract

A beam failure recovery method and a terminal are provided. The method is applied to a media access control (MAC) layer of the terminal, and includes: processing a random access procedure in accordance with a preset processing manner, when obtaining a new candidate beam during the random access procedure of transmitting a beam failure recovery request.

What is claimed is: 
     
       1. A beam failure recovery method, applied to a media access control (MAC) layer of a terminal, comprising:
 processing a random access procedure in accordance with a preset processing manner, when obtaining a new candidate beam during the random access procedure of transmitting a beam failure recovery request; 
 wherein before the processing the random access procedure in accordance with the preset processing manner when obtaining the new candidate beam, the beam failure recovery method further comprises: 
 before transmitting the beam failure recovery request during a beam failure recovery procedure, when obtaining at least two candidate beams, indicated by a physical layer, used to transmit the beam failure recovery request, selecting by the MAC layer a beam from the at least two candidate beams to transmit the beam failure recovery request; or selecting by the MAC layer some or all of the at least two candidate beams to transmit the beam failure recovery request in a predetermined order; 
 wherein the predetermined order comprises one of following: 
 a sequential order of random access resources corresponding to the at least two candidate beams; 
 an order of measurement results of the at least two candidate beams; 
 a random order; 
 a sequential order of random access resources corresponding to candidate beams whose measurement results are better than a preset threshold, in the at least two candidate beams; 
 an order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; or 
 a random order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold. 
 
     
     
       2. The beam failure recovery method according to  claim 1 , wherein the processing the random access procedure in accordance with the preset processing manner comprises one of following:
 ignoring the new candidate beam, and continuing to perform the random access procedure; 
 terminating the random access procedure; 
 continuing to perform the random access procedure, and transmitting, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to an original candidate beam; 
 terminating the random access procedure, and retransmitting the beam failure recovery request in a random access resource corresponding to the new candidate beam; 
 restarting the random access procedure, and transmitting a beam failure recovery request in a random access resource corresponding to the new candidate beam; or 
 continuing to perform the random access procedure, and transmitting, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to the new candidate beam. 
 
     
     
       3. The beam failure recovery method according to  claim 1 , wherein after processing the random access procedure in accordance with the preset processing manner, the method further comprises: when the random access procedure fails, performing at least one of following operations:
 transmitting the beam failure recovery request in a common random access resource; 
 indicating, to an upper layer, a failure of the random access procedure; 
 indicating, to a lower layer, a failure of the random access procedure; 
 determining a failure of the beam failure recovery; 
 determining a radio link failure; 
 indicating, to the physical layer, a failure of a current beam failure recovery; or 
 indicating the physical layer to provide a new candidate beam. 
 
     
     
       4. The beam failure recovery method according to  claim 3 , wherein after transmitting the beam failure recovery request in the common random access resource, the method further comprises: when a failure occurs to transmitting the beam failure recovery request, performing one of following operations:
 indicating, to the upper layer, a failure indication about the failure of transmitting the beam failure recovery request; 
 indicating, to the lower layer, a failure indication about the failure of transmitting the beam failure recovery request; 
 determining the failure of the beam failure recovery; 
 determining a radio link failure; 
 indicating, to the physical layer, the failure of the current beam failure recovery; or 
 indicating the physical layer to provide the new candidate beam. 
 
     
     
       5. The beam failure recovery method according to  claim 1 , wherein the new candidate beam is indicated to the MAC layer by the physical layer, or the new candidate beam is determined by the MAC layer based on at least one of evaluation or selection. 
     
     
       6. The beam failure recovery method according to  claim 1 , wherein before obtaining the new candidate beam, the method further comprises indicating the physical layer to provide a candidate beam, in a case that at least one of following conditions is met:
 a condition that the MAC layer or the physical layer triggers the beam failure recovery; 
 a condition that the number of beam failure instances of the MAC layer or the physical layer reaches a preset number; 
 a condition that a failure occurs to a random access procedure initiated by the MAC layer in a random access resource corresponding to a current candidate beam; 
 a condition that a failure occurs to a random access preamble transmission at the MAC layer; 
 a condition that a failure occurs to a contention-free random access at the MAC layer; or 
 a condition that a failure occurs to a contention-based random access at the MAC layer. 
 
     
     
       7. The beam failure recovery method according to  claim 1 , wherein before processing the random access procedure in accordance with the preset processing manner, the method further comprises:
 detecting whether a beam failure recovery timer expires; and 
 processing the random access procedure in accordance with the preset processing manner, in a case that the beam failure recovery timer does not expire. 
 
     
     
       8. The beam failure recovery method according to  claim 1 , wherein the selecting the beam from the at least two candidate beams to transmit the beam failure recovery request comprises one of following:
 selecting the beam with an optimum measurement result from the at least two candidate beams to transmit the beam failure recovery request; 
 selecting the beam with an optimum measurement result from candidate beams in the at least two candidate beams to transmit the beam failure recovery request, wherein measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; 
 selecting any one of the at least two candidate beams to transmit the beam failure recovery request; 
 selecting any one beam from candidate beams in the at least two candidate beams, to transmit the beam failure recovery request, wherein measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; 
 selecting a beam from the at least two candidate beams to transmit the beam failure recovery request, wherein the random access resource associated with the beam in the at least two candidate beams is a nearest random access resource; or 
 selecting a beam from candidate beams in the at least two candidate beams whose measurement results are better than a preset threshold, to transmit the beam failure recovery request, wherein a random access resource associated with the beam from the candidate beams is a nearest random access resource. 
 
     
     
       9. A terminal, comprising: a processor, a memory, and a program that is stored on the memory and executable on the processor, wherein when executing the program, the processor is configured to:
 process a random access procedure in accordance with a preset processing manner, when obtaining a new candidate beam during the random access procedure of transmitting a beam failure recovery request; 
 wherein the processor is further configured to perform the following operation, before the processing the random access procedure in accordance with the preset processing manner when obtaining the new candidate beam: 
 before transmitting the beam failure recovery request during a beam failure recovery procedure, when obtaining at least two candidate beams, indicated by a physical layer, used to transmit the beam failure recovery request, select by a media access control (MAC) layer a beam from the at least two candidate beams to transmit the beam failure recovery request; or select by a media access control (MAC) layer some or all of the at least two candidate beams to transmit the beam failure recovery request in a predetermined order; 
 wherein the predetermined order comprises one of following: 
 a sequential order of random access resources corresponding to the at least two candidate beams; 
 an order of measurement results of the at least two candidate beams; 
 a random order; 
 a sequential order of random access resources corresponding to candidate beams in the at least two candidate beams whose measurement results are better than a preset threshold; 
 an order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; or 
 a random order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold. 
 
     
     
       10. The terminal according to  claim 9 , wherein the processor is further configured to:
 ignore the new candidate beam, and continue to perform the random access procedure; 
 terminate the random access procedure; 
 continue to perform the random access procedure, and transmit, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to an original candidate beam; 
 terminate the random access procedure, and retransmit the beam failure recovery request in a random access resource corresponding to the new candidate beam; 
 restart the random access procedure, and transmit a beam failure recovery request in a random access resource corresponding to the new candidate beam; or 
 continue to perform the random access procedure, and transmit, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to the new candidate beam. 
 
     
     
       11. The terminal according to  claim 9 , wherein the processor is further configured to: perform, when the random access procedure fails, at least one of following operations:
 transmitting the beam failure recovery request in a common random access resource; 
 indicating, to an upper layer, a failure of the random access procedure; 
 indicating, to a lower layer, a failure of the random access procedure; 
 determining a failure of the beam failure recovery; 
 determining a radio link failure; 
 indicating, to the physical layer, a failure of a current beam failure recovery; or 
 indicating the physical layer to provide a new candidate beam. 
 
     
     
       12. The terminal according to  claim 11 , wherein the processor is configured to: when a failure occurs to the transmitting the beam failure recovery request, perform one of following operations:
 indicating, to the upper layer, a failure indication about the failure of transmitting the beam failure recovery request; 
 indicating, to the lower layer, a failure indication about the failure of transmitting the beam failure recovery request; 
 determining the failure of the beam failure recovery; 
 determining the failure of the radio link; 
 indicating, to the physical layer, the failure of the current beam failure recovery; or 
 indicating the physical layer to provide the new candidate beam. 
 
     
     
       13. The terminal according to  claim 9 , wherein the new candidate beam is indicated to the MAC layer by the physical layer, or the new candidate beam is determined by the MAC layer based on at least one of evaluation or selection. 
     
     
       14. The terminal according to  claim 9 , wherein the processor is further configured to indicate the physical layer to provide a candidate beam, in a case that at least one of following conditions is met:
 a condition that the MAC layer or the physical layer triggers the beam failure recovery; 
 a condition that the number of beam failure instances of the MAC layer or the physical layer reaches a preset number; 
 a condition that a failure occurs to a random access procedure initiated by the MAC layer in a random access resource corresponding to a current candidate beam; 
 a condition that a failure occurs to a random access preamble transmission at the MAC layer; 
 a condition that a failure occurs to a contention-free random access at the MAC layer; or 
 a condition that a failure occurs to a contention-based random access at the MAC layer. 
 
     
     
       15. The terminal according to  claim 9 , wherein the processor is further configured to:
 detect whether a beam failure recovery timer expires; and 
 process the random access procedure in accordance with the preset processing manner, in a case that the beam failure recovery timer does not expire. 
 
     
     
       16. The terminal according to  claim 9 , wherein the processor is configured to:
 select the beam with an optimum measurement result from the at least two candidate beams to transmit the beam failure recovery request; 
 select the beam with an optimum measurement result from candidate beams in the at least two candidate beams to transmit the beam failure recovery request, wherein measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; 
 select any one of the at least two candidate beams to transmit the beam failure recovery request; 
 select any one beam from candidate beams in the at least two candidate beams, to transmit the beam failure recovery request, wherein measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; 
 select a beam from the at least two candidate beams to transmit the beam failure recovery request, wherein a random access resource associated with the beam in the at least two candidate beams is a nearest random access resource; or 
 select a beam from candidate beams in the at least two candidate beams whose measurement results are better than a preset threshold, to transmit the beam failure recovery request, wherein a random access resource associated with the beam from the candidate beams is a nearest random access resource. 
 
     
     
       17. A non-transient computer-readable storage medium, wherein a program is stored on the non-transient computer-readable storage medium, and the program is executed by a processor to:
 process a random access procedure in accordance with a preset processing manner, when obtaining a new candidate beam during the random access procedure of transmitting a beam failure recovery request; 
 wherein the program is further executed by the processor to perform the following operation, before the processing the random access procedure in accordance with the preset processing manner when obtaining the new candidate beam: 
 before transmitting the beam failure recovery request during a beam failure recovery procedure, when obtaining at least two candidate beams, indicated by a physical layer, used to transmit the beam failure recovery request, select by a media access control (MAC) layer a beam from the at least two candidate beams to transmit the beam failure recovery request; or select by a media access control (MAC) layer some or all of the at least two candidate beams to transmit the beam failure recovery request in a predetermined order; 
 wherein the predetermined order comprises one of following: 
 a sequential order of random access resources corresponding to the at least two candidate beams; 
 an order of measurement results of the at least two candidate beams; 
 a random order; 
 a sequential order of random access resources corresponding to candidate beams whose measurement results are better than a preset threshold, in the at least two candidate beams; 
 an order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold; or 
 a random order of measurement results of candidate beams, wherein the measurement results of the candidate beams in the at least two candidate beams are better than a preset threshold. 
 
     
     
       18. The non-transient computer-readable storage medium according to  claim 17 , wherein processing the random access procedure in accordance with the preset processing manner comprises one of following:
 ignoring the new candidate beam, and continuing to perform the random access procedure; 
 terminating the random access procedure; 
 continuing to perform the random access procedure, and transmitting, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to an original candidate beam; 
 terminating the random access procedure, and retransmitting the beam failure recovery request in a random access resource corresponding to the new candidate beam; 
 restarting the random access procedure, and transmitting a beam failure recovery request in a random access resource corresponding to the new candidate beam; or 
 continuing to perform the random access procedure, and transmitting, in a next random access preamble transmitting procedure, a random access preamble in a random access resource corresponding to the new candidate beam. 
 
     
     
       19. The non-transient computer-readable storage medium according to  claim 17 , wherein the program is further executed by the processor to: after processing the random access procedure in accordance with the preset processing manner, when the random access procedure fails, perform at least one of following operations:
 transmitting the beam failure recovery request in a common random access resource; 
 indicating, to an upper layer, a failure of the random access procedure; 
 indicating, to a lower layer, a failure of the random access procedure; 
 determining a failure of the beam failure recovery; 
 determining a radio link failure; 
 indicating, to the physical layer, a failure of a current beam failure recovery; or 
 indicating the physical layer to provide a new candidate beam. 
 
     
     
       20. The non-transient computer-readable storage medium according to  claim 17 , wherein the new candidate beam is indicated to the MAC layer by the physical layer, or the new candidate beam is determined by the MAC layer based on at least one of evaluation or selection.